Restructuring, Impairment and Other - Schedule of Changes in the Restructuring and MEPP Reserves (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	$ 52.6
Restructuring and Other Charges	13.0
Foreign Exchange and Other	(0.7)
Cash Paid	(11.8)
Balance at the end	53.1
Employee terminations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	3.4
Restructuring and Other Charges	8.1
Foreign Exchange and Other	0.0
Cash Paid	(6.2)
Balance at the end	5.3
Other
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	8.6
Restructuring and Other Charges	4.2
Foreign Exchange and Other	(0.7)
Cash Paid	(3.9)
Balance at the end	8.2
MEPP withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Balance at the beginning	40.6
Restructuring and Other Charges	0.7
Foreign Exchange and Other	0.0
Cash Paid	(1.7)
Balance at the end	$ 39.6